Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
|
Asthenosphere |
a layer of 'plastic' semi-solid rock in the lower mantle
|
|
|
Continental Drift
|
the separating of continents by drifting across the oceans - the break-up of Pangaea into Laurasia and Gondwana
|
|
|
Magnetic striping
|
patterns of magnetism trapped in rocks on each side of plate boundaries
|
|
|
Ocean trench
|
a deep trench or downward fold in the ocean floor that is much deeper than the surround sea bed - the Mariana Trench near Japan
|
|
|
Plate tectonics
|
the theory that the Earth's crust is cracked into many large pieces that move on the asthenosphere - like the skin on custard
|
|
|
Rifting
|
the process of continents breaking up, subsiding and then allowing in the ocean - eg the Great Rift Valley of East Africa
|
|
|
Seafloor spreading
|
the process of new crust forming at the mid-ocean ridges and spreading outwards - eg the mid-Atlantic Ridge between the Americas and Europe/Africa
|
|
|
Subduction
|
where the crust is sinking down into the earth - usually an oceanic plate sliding beneath a continental plate eg the Pacific plate sliding under Asia |
